26 
Proceedings of the Koval Society of Edinburgh. [Sess. 
For comparison, I give in tabular form the dimensions of the Antarctic 
and Arctic species 
Lafoeina longitheca. 
Lafoeina tenuis. 
Present 
specimens. 
Jader- 
holm. 5 s 
specimens. 
Hickson 
and 
Gravely’s 
specimens. 
Sars’s 
figures 
(1873).* 
Jader- 
holm’ s 
figures 
(1909)* 
mm. 
mm. 
mm. 
mm. 
mm. 
Stolon, diameter 
0-06-0-07 
Hydrotheca, length 
0-60-0-98 
0-7-1-7 
0-7-P25 
0-43-0-52 
0-32 
diameter . 
0-14-0-18 
0-08-0-13 
... 
0-14 
0-12 
Sar cotheca, length . 
0-11-0-55 
0-10-0-25 
0-12-0-20 
0-20-0-44 
0-22 
diameter of pedicel 
0-025-0-032 
0-02 
0-02 
„ head . 
0-042-0-048 
length of head 
0-062 
* These dimensions, calculated from magnified figures, must be taken as approximate only. 
Locality. — Bay (east of Cape Royds), 7 to 8 fathoms, June 1908, on a 
Polyzoon. 
Distribution. — Recorded from both sides of the Antarctic continent : 
various localities in South Georgia, 64-250 metres (Jaderholm, 1905) ; 
M‘Murdo Bay, 5 to 20 fathoms (Hickson and Gravely, 1907); and present 
record. 
Family Lafoeim:. 
Filellum (?) expansum, Levinsen. 
Filellum (?) expansum , Levinsen, 1893, p. 30, pi. vii. fig. 6, 7. Idem , Jaderholm, 
1909, pp. 21, 77, pi. vii. fig. 12. 
Lafoea expansa, Billard, 1907, p. 179. 
I record this species, because it has been regarded by several workers 
as a Hydroid, without being at all convinced that it belongs to this group. 
Here, as in other cases, only the empty tube is present, and the critical 
animal has again escaped detection. Our specimens are on the whole 
larger than those which occur in northern waters, judging by Billard’s 
measurements (1907, p. 180). 
Dimensions . — 
Hydrotheca, length free . . . 0'15-0'20 mm. 
„ adnate . . 0-19-0-24 mm. 
diameter (at mouth) . 0’07-0'08 mm. 
Localities. — M‘Murdo Sound, 25 to 50 fathoms, July 1908. Specimens 
were also observed on a Polyzoon from Cape Royds, 30 to 80 fathoms, 
August 1908. 
